Physical and Chemical Properties:
Industrial-grade toluene is a colorless, transparent liquid with an odor similar to benzene. Like benzene, toluene is insoluble in water but can mix with a variety of solvents such as methanol, ethanol, butanone, glacial acetic acid, and benzene. Toluene is capable of dissolving drying oils and polyvinyl chloride. Adding ethanol to toluene can effectively improve the solubility of cellulose acetate. Due to its high volatility (about three times that of xylene), toluene is now rarely used as an industrial solvent.
Industrial mixed xylene is a colorless, transparent liquid with a faint fluorescence and a characteristic aromatic hydrocarbon odor. Xylene is insoluble in water and can mix with alcohols, ethers, aromatic hydrocarbons, and aliphatic hydrocarbons. Due to its excellent solvency and moderate evaporation rate, xylene is widely used as a solvent today.
Toluene does not have isomers, whereas xylene has three isomers: ortho, meta, and para-xylene. Xylene used in paints is typically a mixture of these three isomers.
Different Uses:
Toluene, as a solvent and gasoline additive, is a key organic chemical raw material. Many intermediates derived from toluene are widely used in the production of dyes, pharmaceuticals, pesticides, and additives. It is also used in the manufacture of fine chemicals such as fragrances and in the synthetic materials industry.
Xylene is widely used as a solvent in industries such as coatings, resins, dyes, and inks. It is also used in pharmaceuticals and pesticides. Additionally, xylene is a high-octane gasoline and an important organic chemical raw material. It can also be used to remove asphalt from vehicle bodies and is used in hospital pathology mainly for tissue sectioning and de-waxing.
